Android Working with Radio Buttons

activity_main.xml

    <RadioGroup
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:id="@+id/radioGroupFruits">


        <RadioButton
            android:text="@string/apple"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/textView"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:id="@+id/radioButtonApple"
            android:onClick="radioButton_onClick"/>

        <RadioButton
            android:text="@string/orange"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/radioButtonApple"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:id="@+id/radioButtonOrange"
            android:onClick="radioButton_onClick"/>

        <RadioButton
            android:text="@string/banana"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/radioButtonOrange"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:id="@+id/radioButtonBanana"
            android:onClick="radioButton_onClick"/>
    </RadioGroup>

MainActivity.java

    TextView textViewResult;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textViewResult=(TextView) findViewById(R.id.textViewResult);
    }

    protected void radioButton_onClick(View view)
    {
        Boolean checked=((RadioButton) view).isChecked();
        RadioButton selected=(RadioButton) view;

        switch (selected.getId())
        {
            case R.id.radioButtonApple:

                if (checked)
                {
                    textViewResult.setText("Apple");
                }

                break;
            case R.id.radioButtonOrange:

                if (checked)
                {
                    textViewResult.setText("Orange");
                }

                break;
            case R.id.radioButtonBanana:

                if (checked)
                {
                    textViewResult.setText("Banana");
                }

                break;
        }

    }

References
https://www.youtube.com/watch?v=fGF6lWjJ9Os&index=14&list=PLshdtb5UWjSp0879mLeCsDQN6L73XBZTk
https://github.com/mhdr/AndroidSamples/tree/master/009

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